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He had wheeled round from her, carried away in the triumph and rapture of the sestette.
You have much too great a habit of speaking of a special octave, sestette, or line.
The opening phrases of both octave and sestette are very fine; but the second quatrain and the second terzina, though with a quality of beauty, both seem somewhat to lack distinctness.
Thus the sonnet, which had been an octave of enclosed or alternate rhymes, followed by a sestette of interlaced tercets, was now changed to a series of three quatrains with differing sets of alternate rhymes in each, at the close of which the insidious couplet succeeded in establishing itself.
It was a great surprise to find part of the sestette copied in the "Prose Writings" of Walt
Here is another link -- José de Herédia, and his jewelled and chiselled sonnets -- the "Antique Medal" with its peerless sestette, which combines the essential meanings of Keats's "Ode to a Grecian Urn."